Take-up mechanism for sewing-machines.



E. ERICKSON.

TAKE-UP MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JULYH. 1914.

1 1 49, 3 5 1 Patented Aug. 10, 1915.

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E. ERICKSON. TAKE-UP MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JULY I7. I914.

1,149,351. Patented 10, 1915.

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E. ERICKSON.

TAKE-UP MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JULY I1, 1914.

1,M9,351. Patented Aug. 10, 1915.

3 SHEETS-SHEET 3.

t t a EDWARD ERICKSON, or LYNN, MASSACHUSETTS, AssieNoR T0 VICTOR snon MACHINERY 00., or :BOs'roN, MASSACHUSETTS, A CORPORATION or ivressA CHUSE'ITS. I

TAKE-UP MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented g. 10, 1915.

Original application filed December 28, 1912,,Se1ia1 No. 739,056. Divided and this application filed July 17,

i 1914. SeriaI No. 852,100. g

To all whom it may concern:

Be it known that I, EDWARD ERICKSON, a subject of the King of Sweden, and a resident of Lynn, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Take- Up Mechanisms for Sewing-Machines, of which the following is a specification.

This invention relates to machines for sewing heavy material such as leather, and refers particularly to that type of such machines known as welt sewing machines.

The object of the invention is to provide an improved takeup mechanism for lockstitch sewing machines such as is shown in another application of mine filed December 28, 1912, Serial No. 739,056, of which this application is a division.

The invention consists in certain novel features of construction and arrangement of parts which will be fully understood by reference to the description of the drawings and to the claims hereinafter given. 1

Of the drawings, Figure 1 represents a vertical section of a machine embodying the features of the present invention, looking toward the left end. Fig. 2 represents asimilar section looking towardthe right of the machine. Fig. 3 represents an elevation of the presser foot and its bar and operating mechanism. Fig. 4-. represents an elevation of the take-up mechanism, and Fig. 5 represents a sectional detail to be hereinafter referred to.

Similar characters designate like parts throughout the several figures of the drawm 's.

The base 30 of the machine is provided with two uprights or standards 31, 32. The,

main shaft 3e has a drivingpulley 38 at one end and at its other end is provided with a spiral gear 39meshing with a pinion d0 secured to a shaft 41 mounted in a bracket 42 supported by the top of the standard 31. The gear 39and-pinion 4E0 operate suitable mechanisms for driving the shuttle 53, but as these mechanisms form no part of the present invention, they are neither shown nor described herein.

The machine is provided with the usual work support 71 and an arm 74 carrying a presser foot 75 adapted to hold the work in position on said work support 71.

The arm 74 having the presser foot 75 (Figs. 2 and 3) is secured, by means of suitable screws or bolts, in a recess 7 6 (Fig. 3) of an arm 77 of a lever, the other arm 78 of which is formed or provided with a se ment rack 79 meshing with a pinion 80. The lever 77, 78 is pivotally supported on a sleeve 31 indicated by dotted lines in Fig. 2. The pinion 80 has a sleeve hub 82 mounted loosely upon a pin or stud shaft 83 eccentrically, carried by a disk 8-1 (Fig. 5), said disk being carried by a stud shaft 85 mounted in an arm 86 of the standard 32. A split ring 87 is clamped upon the disk 84, as by means of a binding screw or bolt 88, said ring 87 having an arm 89 provided with a roll 90 engaging a cam groove .91 in one side of a cam disk 92 carried by the shaft 3%, whereby, at certain periods, the pin 83 on which the pinion 80 is mounted, is oscillated relatively to the axis of the stud shaft 85. The split ring 87 enables an adjustment to be effected between the arm 89 and the disk 84.

To cause the presser foot to bear with yielding pressure upon the work, a spring 93 is employed (Fig. 5), one end of said spring being connected to the pinion 80 and the other end connected to a collar 9%, the latter having a series of radial notches 95 in its outer end, with either one of which a pin 96 projecting from pin 83 is adapted to be engaged. The pin and notch construction just described is for the purpose of enabling the tension of spring 93 to be adjusted so as to force said spring to act through the pin ion 80 and the segment-toothed arm 78 to lower the presser foot 75.

To effect the locking of the presser foot to hold the work tightly during the formation of each stitch, and to release it during the feed of the work, the following mechanism is provided. Mounted upon the sleeve hub 82 of the cam 80 are the two recessed hubs 97, 98, a spring 99 beinglocated in the recess, and adapted, as presently explained, to act as a brake upon the outer periphery ofthesleeve hub 82. One end of said spring is connected to the hub 98, and the other to the hub 97. The latter has an arm 100 provided with a pin 101 which enters a slot in an adjustably fixed arm 102 pivotally connected at 103 to the standard 32 (Fig. 2).

formation of the stitch.

The hub 98 has an arm 106 (Fig. 3) whichis connected by a link 107 to one arm 108 of an elbow lever pivoted at'109, the other arm 110 having a roll which engages a cam groove 111 in the side of the cam disk 92. The pivot 109 is a pin which extends through the standard 32 and projects at each end from said standard, being mounted to oscillate in a hole in said standard. At one end this pin 109, which is practically a rockshaft, has a pinion 112 (Fig. 2) meshing with a rack 113 carried by a vertically movable rod 114, which may be connected to a treadle not shown to raise the presser foot when work is to be introduced.

The other end of the rockshaft 109 is provided with a cam-shaped projection 116 (Fig. 3) which enters an opening in one end of apivoted arm 117, said arm being piv otally connected at 118 to the arm 110 of the elbow lever. The arm 117 has a roll 119 which bears against the periphery of the cam disk 92, the latter having a recess or depression 120. As will be readily understood, when the parts occupy the relative positions shown in Fig. 3, the arm 117 forms practically a rigid portion of the arm110 of the elbow lever, the rolls carried by these two arms, engaging opposite sides of the rib of the cam disk 92 which separates the cam groove 111 from the periphery of the cam, and therefore as the cam disk rotates the elbow lever is oscillated, the structure and operation of the parts being such that when the operative portion of the cam groove 111 reaches the roll or arm 110 the elbow lever is oscillated to tighten the brake spring 99 (Fig. 5) this occurring during the When necessary, the operation of the foot treadle rod 11 1 acts to oscillate the rockshaft 109 to rotate the cam projection 116 sufficiently to allow relative movement of arms 110, 117 so as to permit the presser foot to be raised regardless of the rotative position of the cam disk 92;;

;As best shown in Fig. 3, the inner wall of the cam groove 111 is provided with a recess 121 which, when it arrives opposite the roll ofthe arm 110, will permit said roll tomove towardthe aXis of rotation of the cam disk 92 so as to relieve outward pressure on said roll and thus releasethe braking effect of the brake spring 99 and permit the presser foot to be lifted.

The take-up arm 125 (Figs. 2 and 4) is pivotally connected at 126 to one end of a shaft 127, the pivot connection of the takeup lever or arm being eccentric to the axis of the shaft 127, as shown in Figs. 2 and 3. The bearing for the shaft 127 is indicated at 1.30 in Fig. 2. The take-up arm is provided with two rolls 128 (Figs. 2 and 4), a roll 129 being stationarily mounted. The other end of shaft 127 is provided with an arm 131 (Fig. 3) which is sweated or otherwise secured to saidshaft, said arm 131 being connected by a link '132 with the arm 78 of the presser foot lever. As shown in Fig. 4, a roll 133 is stationarily mounted, the needle thread a passing from the thread lock 1.34 hereinafter described, and over the roll 133, under rolls 128 and to the needle. The stationary roll 129 is in such position that when the take-up lever moves downwardly toward and to the position indicated by dotted lines in Fig. 4, the thread will be taken up in two loops instead of one as customary heretofore, so that the take-up needs to have imparted to it but one-half the usual motion of throw. The short arm of the take-up lever is provided with a roll 135 which is acted upon by a cam 136 (Fig. 1) the take-up lever being actuated so as to keep the roll 135 in contact with the cam by means of a suitable spring such as indicated at 137 in Fig. 4.

The structure just described varies the amount of thread taken up bythe take-up according to the thickness of the work. Heferring to Fig. 3, if the presser foot 75 is held in a. higher position than shown, due

to the presence of thicker work between it I and the work rest, the connection by means of the link 132 oscillates the shaft 127'so as to shift the position of the pivot 126, thus changing the position of the fulcrum of the take-up arm to bodily move the latter upwardly. \Vhen the'lever 125 is in its highest position due to the changed position of its fulcrum 1.26 and its outer end is moved downwardly by the action of the cam 136 it is apparent that the thread .awill be taken up .in a single loop a portion thereof eX- tending in a straight line between the rolls 128. When the thicker work is being operated upon the necessary takeup of the thread can be effectively accomplished in a" single a predetermined distance without the thread a contacting with the roll 129, but when the lever 125 is moved downwardly beyond a given point, the thread awill come in contact with this roll 129 and the thread will immediately commence to be taken up in two loops instead of one. It is self-evident, therefore, owing to the changing position of the fulcrum 126 and the changed initial position of the lever 125 that for the thickest work the necessary amount of thread may be taken up in a single loop and for the thinnest work the required amount of thread may all be taken up in two loops, or for intermediate thicknesses of material the thread will be taken up in a single loop during the first part of the movement of the takeup lever and in two loops during the last part of its movement. The advantages of a construction that permit-s this operation are so apparent as to require no detailed statement.

The machine is provided with a suitable thread lock 134:, but as this forms no part of the present invention, it is not deemed necessary to illustrate or describe the same.

The needle 151 has its carrier 152 (Fig. 1) pivotally mounted on the fixed pin 153. The carrier 152 has a rearwardly projecting arm 151 connected by a link 155 with an arm 156 which is fixedly but adjustably secured to one end of a rookshaft- 157 (Fig. 1) from which movement is imparted to said needle to cause it to enter the work after being pierced by the awl 175 The machine is also provided with all of the necessary devices for forming the stitch but as these mechanisms form no part of the present invention they are neither shown nor described. For the operation of these devices reference may be made to the application 789,056, of which this is division.

This makes a very simple and effective take-up mechanism, the operation of which is automatically controlled by the varying position of the presser foot as it pressed into contact with work of different thicknesses.

The operation and many advantages of this invention it is believed will be fully understood from the foregoing description.

Having thus described my invention, I claim:

1. In a sewing machine, stitch forming mechanism including a takeup lever having two thread-engaging rolls, stationarily mounted rolls on opposite sides of the lever, means for actuating the lever to move its rolls past opposite sides of one of said stationary rolls to take up the thread in two loops, and means for changing the position of the fulcrum of said lever to vary the position of the throw of the takeup.

2. In a sewing machine, the combination with an oscillating presser foot carrier, of a take-up lever having an eccentrically mounted fulcrum, and connections including a link from said presser foot carrier to rock said fulcrum to vary the position of the throw of the take-up according to the thickness of work under the presser foot.

3. In a sewing machine, the combination with an oscillating presser foot carrier, of a takeup lever having an eccentrically mount ed fulcrum, an arm projecting from said fulcrum, and a link connecting said arm with a portion of the presser foot carrier to rock said fulcrum to vary the position of the throw of the take-up according to the thickness of work under the presser foot.

1. In a sewing machine, a thread take-up consisting of a lever, a fulcrum therefor, two thread engaging members carried by said lever and disposed thereon between the outer end of said lever and its pivot, means for moving said lever about its fulcrum, means positioned between the outer member and the lever pivot coacting with said members whereby during the movement of said lever the thread will be drawn out in two loops, and means for changing the position of said fulcrum.

5. In a sewing machine, a thread take-up consisting of a lever, a fulcrum therefor, two thread engaging members carried by said lever, means for moving said lever about its fulcrum, means coacting with said members whereby during the movement of said lever the thread will be drawn out in two loops, and means for automatically changing the position of said fulcrum to vary the amount of take-up for varying thicknesses of material.

6. In a sewing machine, the combination of a fixed thread engaging member; a takeup lever carrying a thread engaging member; a fulcrum for said lever; an oscillating shaft on the end of which said fulcrum is eccentrically mounted; an arm radiating from said shaft; 21 presser foot carrier and a link between said arm and presser foot car-- rier whereby the oscillations of the presser foot due to varying thicknesses of material will change the position of said fulcrum-and vary the action of the thread takeup lever.

7. In a sewing machine, stitch forming mechanism including a pivoted takeup lever having two thread engaging rolls; a stationary thread support; means for swinging said takeup lever about its pivot to move the rolls thereon away from the work and said stationary thread support; a stationary thread engaging member positioned on the opposite side of said lever; and means for moving said lever bodily toward or from said thread engaging member prior to its swinging movement.

8. In a sewing machine, stitch forming mechanism including av takeup lever having two-thread-engaging rolls; a stationary thread support; a movable fulcrum for said lever; means for swinging said lever about its fulcrum to move said rolls away from the work and said stationary thread support; means for changing the position of said fulcrum to vary the starting position of said lever; and a stationary thread engaging member on the opposite side of said lever intermediate said rolls and with which the thread between said rolls is adapted to engage in the final movement of said takeup lever about its fulcrum.

9. I11 a sewing machine, stitch forming mechanism including a takeup lever having two thread-engaging rolls; a stationary thread support; a movable fulcrum for said lever; means for swinging said lever about its fulcrum to move said rolls away from the work and a stationary thread support; means controlled by the movement of the presser foot for changing the position of said fulcrum to vary the starting position of said lever; and a stationary thread engaging member on the opposite side of said lever intermediate said rolls and with which the thread between said rolls is adapted'to engage in the final movement of said takeup lever about its fulcrum.

10.In a sewing machine, stitch forming mechanism including a presser foot; stationary thread supports; takeup mechanism including an oscillating takeup lever the operation of which is controlled by the movement of said presser foot; and means coact-,

ing with said lever and adapted to change the position thereof relatively to said thread supports whereby the thread may be taken up in a single loop for thick work and in two loops for thin Work.

Copies of this patent may be obtained for five cents each; by addressing the 11. In a sewing machine, stitch forming mechanism including a presser foot; an oscillating takeup lever; a movable fulcrum therefor the position of which is controlled by said presser foot; and means coacting with said lever whereby for thick work the thread will be taken up in a single loop and will be taken up in two loops for thin work.

12. In 'a sewing machine, stitch forming mechanism including a presser foot; an oscillating takeup lever; a movable fulcrum therefor the position of which is controlled by said presser foot, thereby varyin the starting position of the throw of the ever; and means coacting with said lever whereby during its throw with its fulcrum in one position the thread will be taken up in one loop and with the fulcrum in another position said thread will be taken up in two loops.

13. In a sewing machine, stitch forming mechanism including a presser foot; an oscillating takeup lever; a movable fulcrum controlled by the presser foot thereby varying the starting position of the throw of said lever; and means coacting with said lever whereby for certain thicknesses of work the thread will be taken up in a single loop at the beginning of the throw of said lever and subsequently be taken up in two loops.

Signed by me at Boston, Mass., this 18th day of June, 1914.

EDWARD ERICKSON.

WVitnesses:

EDWARD F. ALLEN, WALTER E. LOMBARD.

Commissioner of Patents,

Washington, .D. 6. 

